集成阶段 3：加载和卸载 NavData

#include "gwnavruntime/navdata/navdata.h"
#include "gwnavruntime/kernel/SF_File.h"
#include "gwnavruntime/base/fileopener.h"
...

class MyGameLevel
{
public:
    ...
    bool Initialize(Kaim::World* world);
    ...
    void Destroy();
    ...
protected:
    Kaim::Ptr<Kaim::NavData> m_navData;
    ...
};

bool MyGameLevel::Initialize(Kaim::World* world)
{
    Kaim::Ptr<Kaim::File>   kaimFile;
    Kaim::DefaultFileOpener fileOpener;

    // Open the NavData file.
    const std::string navdataFilePath = TestSystem::Instance().InputDir() + "GeneratedNavData/opencastle/opencastle.NavData";
    kaimFile = fileOpener.OpenFile(navdataFilePath.c_str(), Kaim::OpenMode_Read);
    if(kaimFile == KY_NULL)
        return false;

    // Instantiate and load the NavData from the file contents.
    m_navData = *KY_NEW Kaim::NavData;
    KyResult loadingResult = KY_ERROR;
    loadingResult = m_navData->Load(kaimFile); 

    // Close the NavData file.
    kaimFile ->Close();
    kaimFile = KY_NULL;

    // Check that the NavData have been correctly loaded.
    if (KY_FAILED(loadingResult))
        return false;

    // Add the NavData to the Database.
    // AddToDatabaseImmediate() forces the new NavData to be added and
    // stitched immediately in the current frame. In your final game, you
    // will probably want to use AddToDatabaseAsync(), which time-slices
    // the addition of the new data over multiple frames to avoid CPU peaks.
    m_navData->Init(world->GetDatabase(0));
    m_navData->AddToDatabaseImmediate();

    ...
    return true;
}
...

void MyGameLevel::Destroy()
{
    ...
    m_navData->RemoveFromDatabaseImmediate();
    m_navData = KY_NULL;
    ...
}

class MyGameWorld
{
    ...
protected:
    ...
    MyGameLevel m_gameLevel;
    ...
};

bool MyGameWorld::Initialize()
{
    ...
    return m_gameLevel.Initialize(m_world);
}
...

void MyGameWorld::Destroy()
{
    m_gameLevel.Destroy();
    ...
}